Preso Meters” fire-pump flowmeter systems are designed for simple, precise, and economical testing of fire-pump performance. Flow monitoring is achieved by allowing the operator to read the water flow directly in GPM or LPS. The fire-pump systems” primary elements are designed to produce a differential pressure to attain accurate flow measurements. Three types of fire-pump systems are available for pipe sizes from two inches to 16 inches. Models include the PFA Ellipse, PFV Venturi, and the PFB Annular pitot tube. The systems offer low permanent pressure loss and require little maintenance. The PFA Ellipse model is FM-approved. The elliptical shape is designed with a series of ports facing the upstream velocity pressures and flow sensing ports strategically located ahead of the trailing edge flow separation. The PFV FM-approved model features the Preso Venturi. It can be installed in any position with minimal straight pipe requirements. The PFB Annular model is made up of a round pitot tube. It has an accuracy of +/-3 percent and is capable of bi-directional flow measurement. Each fire-pump system includes a direct-readout gauge with a dial featuring a 270-degree arc for fast and accurate reading. The gauge is made of rugged brass construction and is protected against overload by a unique diaphragm housing design. When the pressure difference exceeds the range, the gauge will accept the accidental application of up to 60 PSIG without damage.